This isn't always true; I know it's wrong in Intel Macs.

2008/11/5 Doug Burton <[EMAIL PROTECTED]>:
>
> The circuitry is nothing more than the jack that you put the plug
> into.  When nothing is plugged in the internal speaker is wired into
> the audio out.  As soon as you put a plug into the jack, the audio is
> then routed to that plug.  It's pretty simple really.
>
> Just a message from Doug...
>
> On Nov 5, 2008, at 3:38 PM, Christopher Icha wrote:
>
>>
>> Busted circuitry!
>>
>> My Ali iMac used to start quietly (I had a minijack plugged in to
>> keep it so).  All of a sudden one day, it started bonging and has
>> done so ever since. It drives me crazy! I thought I had screwed up
>> some settings or something.  Is this busted circuitry a known issue?
>>
>> i
>>
>>
>> On Nov 05, 2008, at 08:19 pm, hackmiester / Hunter Fuller wrote:
>>
>>>
>>> 2008/11/5 Tom <[EMAIL PROTECTED]>:
>>>>
>>>> Thanks Kris! I downloaded and installed that little control panel,
>>>> and
>>>> it does indeed silence the startup chime. That fixed that.
>>>>
>>>> So that's half the problem solved, and the original complaint taken
>>>> care of. But sound continues to come out of the internal speaker the
>>>> rest of the time, such as when I'm editing video in Final Cut, or
>>>> watching a YouTube video. I want to silence this computer completely
>>>> when the headset is plugged in.
>>>>
>>>> If there is no other way to do it, I'll still have to go into the
>>>> box
>>>> and unplug the internal speaker, darn it.
>>>
>>> Looks like you'll have to do that because it sounds like the
>>> circuitry
>>> that detects a plugged-in device and acts on that detection (i.e.,
>>> silences the speaker) is busted.
>>>
>>>>
>>>> Thanks!
>>>>
>>>> Tom
>>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> -hackmiester
>>>
>>>>
>>
>>
>> >
>
>
> >
>



-- 
-hackmiester

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